Abstract
We emphasize the importance of dynamics and hydration for enzymatic catalysis and protein design by transplanting the active site from a haloalkane dehalogenase with high enantioselectivity to nonselective dehalogenase. Protein crystallography confirms that the active site geometry of the redesigned dehalogenase matches that of the target, but its enantioselectivity remains low. Time-dependent fluorescence shifts and computer simulations revealed that dynamics and hydration at the tunnel mouth differ substantially between the redesigned and target dehalogenase.
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Acknowledgements
We thank D. Baker (University of Washington) for helpful comments on the manuscript. This work was supported by the European Regional Development Fund (CZ.1.05/1.1.00/02.0123), the Czech Ministry of Education (LO1214), the Czech Science Foundation (P208/12/G016 to J.S. and M.H. and P503/12/0572 to J.D.) and the 'Employment of Best Young Scientists for International Cooperation Empowerment' program (CZ1.07/2.3.00/30.0037 to J.B.), financed by both the European Social Fund and the state budget of the Czech Republic. The Academy of Sciences is acknowledged for the Praemium Academie award (M.H.). CERIT Scientific Cloud is acknowledged for providing access to their computing facilities under the Center CERIT Scientific Cloud program (CZ.1.05/3.2.00/08.0144).
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J.S. and T.C. conducted fluorescence spectroscopy measurements. J.B. performed molecular modeling. T.K. and A.F. constructed the mutants. T.K. and Z.P. biochemically characterized the mutants. T.K., V.S. and R.C. conducted CD spectroscopy measurements. M.L. and I.K.S. determined the crystal structure. M.H. and J.D. conceived and supervised the project. J.S., J.B., T.K., M.H. and J.D. wrote the paper together.
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Sykora, J., Brezovsky, J., Koudelakova, T. et al. Dynamics and hydration explain failed functional transformation in dehalogenase design. Nat Chem Biol 10, 428–430 (2014). https://doi.org/10.1038/nchembio.1502
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DOI: https://doi.org/10.1038/nchembio.1502
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